Numerical reproduction of middle-scale deep ocean current

Middle-scale deep ocean currents were numerically reproduced by forcing low-wavenumber components of velocity and temperature, which were measured at 7 points at the depth of 1500-2500 m in the real sea. In order to extract low-wavenumber components of the flow data, we reconstructed directional spectra by using the most likelihood method. When forcing them in the computational domain, which has the spatial scale of 100 km and 4000 m in the horizontal plane and the vertical direction, respectively, the flow energy cascades down to high wavenumbers by interactions with topography, rotation, and stratification. Reproduced high-wavenumber field was compared in spectra in the frequency domain well with that of the measurement.